79 lines
2.7 KiB
C#
79 lines
2.7 KiB
C#
namespace AdventOfCode.Utils;
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public static class Extensions
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{
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/// <summary>
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/// Returns a slice of the given list
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/// </summary>
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/// <param name="list">The list you pretend to slice</param>
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/// <param name="startIndex">The first index of the slice</param>
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/// <param name="endIndex">The index after the last index of the slice</param>
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/// <returns></returns>
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public static List<T> Sublist<T>(this List<T> list, int startIndex, int endIndex)
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{
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List<T> result = new List<T>();
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for (int i = startIndex; i < endIndex; i++)
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result.Add(list[i]);
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return result;
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}
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/// <summary>
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/// Returns a column of a give matrix list
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/// </summary>
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/// <param name="list">2 dimensions list</param>
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/// <param name="column">Column index</param>
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/// <returns></returns>
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public static List<T> GetColumn<T>(this List<List<T>> list, int column)
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{
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List<T> result = new List<T>();
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foreach (List<T> row in list) result.AddRange(row.Where((t, i) => i == column));
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return result;
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}
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/// <summary>
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/// Reverses a given list
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/// </summary>
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/// <param name="list">The list to reverse</param>
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/// <returns>The reversed list</returns>
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public static List<T> Reversed<T>(this List<T> list)
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{
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List<T> reversed = new List<T>();
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for (int i = 0; i < list.Count; i++)
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reversed.Add(list[list.Count-1-i]);
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return reversed;
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}
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/// <summary>
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/// Clones a list of elements
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/// </summary>
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/// <param name="original">The original list</param>
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/// <returns>A copy of the original list</returns>
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public static List<T> Clone<T>(this List<T> original)
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{
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List<T> ret = new List<T>(original.Count);
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foreach (T element in original)
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ret.Add(element);
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return ret;
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}
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public static Dictionary<TKey, TValue> Clone<TKey, TValue>
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(this Dictionary<TKey, TValue> original)
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where TValue : ICloneable
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where TKey : notnull
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{
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Dictionary<TKey, TValue> ret = new Dictionary<TKey, TValue>(original.Count, original.Comparer);
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foreach (KeyValuePair<TKey, TValue> entry in original)
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ret.Add(entry.Key, (TValue) entry.Value.Clone());
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return ret;
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}
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public static Dictionary<TKey, List<TValue>> Clone<TKey, TValue>
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(this Dictionary<TKey, List<TValue>> original)
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where TKey : notnull
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{
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Dictionary<TKey, List<TValue>> ret = new Dictionary<TKey, List<TValue>>(original.Count, original.Comparer);
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foreach (KeyValuePair<TKey, List<TValue>> entry in original)
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ret.Add(entry.Key, entry.Value.Clone());
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return ret;
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}
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} |